I seem to stumble upon a situation where "!=" operator misbehaves in python2.x. Not sure if it's my misunderstanding or a bug in python implementation. Here's a demo code to reproduce the behavior -
From __future__ import unicode_literals, print_function
class DemoClass(object):
def __init__(self, val):
self.val = val
def __eq__(self, other):
return self.val == other.val
x = DemoClass('a')
y = DemoClass('a')
print("x == y: {0}".format(x == y))
print("x != y: {0}".format(x != y))
print("not x == y: {0}".format(not x == y))
In python3, the output is as expected:
x == y: True
x != y: False
not x == y: False
In python2.7.3, the output is:
x == y: True
x != y: True
not x == y: False
which is not correct!!
